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1.identical twin n. 同卵双生，全等双生
Isn't it amazing that Mr. Hak - Tak and Mrs. Hak - Tak each have an identical twin!
好奇怪啊, 哈达 夫妇每人都有一个一模一样的双胞胎!
2.sterile adj. 不育的；无菌的；贫瘠的；不毛的；枯燥乏味的
He always made sure that any cuts were protected by sterile dressings.
他总是确保所有伤口都用无菌的敷料包好。
3.radiation n. 辐射；发光；放射物
They suffer from health problems and fear the long term effects of radiation.
他们受健康问题的困扰，还担心遭受辐射造成的长期影响。
